Created attachment 218032 [details]
This isn't a big deal, but Qt itself allows to choose from multiple installed multimedia plugins through QT_MULTIMEDIA_PREFERRED_PLUGINS.
It is odd that the port imposes a limitation that only one plugin, ALSA or PulszeAudio, can be installed at a time.
That sounds indeed reasonable.
I'll look into it.
A commit references this bug:
Date: Sat Sep 26 15:28:49 UTC 2020
New revision: 550194
multimedia/qt5-multimedia: allow PULSE and ALSA options to coexist
In r451940 this was made exclusive, to follow the internal build system
of Qt. However, nowadays, the two backends are coinstallable again.
Submitted by: yuri